/*
 * Copyright 2020-2021, Seqera Labs
 * Copyright 2013-2019, Centre for Genomic Regulation (CRG)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package nextflow.splitter

import groovy.transform.CompileStatic

/**
 * A collector strategy that creates a chunks as {@link List} of objects
 *
 * @author Paolo Di Tommaso <paolo.ditommaso@gmail.com>
 */
@CompileStatic
class ObjectListCollector implements CollectorStrategy {

    private List holder = new LinkedList()

    @Override
    void add(Object record) {
        holder.add(record)
    }

    @Override
    def nextChunk() {
        try {
            return new ArrayList(holder)
        }
        finally {
            holder.clear()
        }
    }

    @Override
    boolean hasChunk() {
        return !holder.isEmpty()
    }

}
